Why doesn't someone speed up the DES search with Hellman's time-space tradeoff, whose precomputation could be done within a month? Alan T. Sherman sherman@cs.umbc.edu
On Thu, 26 Feb 1998, Dr. Alan Sherman wrote:
Why doesn't someone speed up the DES search with Hellman's time-space tradeoff, whose precomputation could be done within a month?
Probably because finding spare CPU cycles on thousands of machines is easy and free, while finding the disk storage space that you mention would be expensive, and I doubt distributed.net has the resources. And people who do have the resources are busy doing other things with them, or keep them at Fort Meade. I forget because I haven't read that part of Applied Crypto in a while, but wasn't it terabytes of storage? -- Andrew Fabbro [afabbro@umich.edu] [andrewf@jesuswept.com] http://www-personal.umich.edu/~afabbro/ 313.647.2713 "When in Bologna will a Fabbro rise again?" --Dante
A few terabytes of storage isn't THAT expensive. Let's see: 1,000,000,000,000 bytes a CDROM holds about 640 MB, which means that 1563 CDs could hold it. At CompUSA, that were recently selling recordable CD's for $10 for five, but with a mail-in $10 rebate which means you're only paying 32 cents for postage for 5 CD's. .32*1563=$500 or so. Add in the cost of a few CD-R drives @ $300 each = $900 for recording. Combined total=$1400 Within the reach of distributed.net, I would think. On Thu, 26 Feb 1998 16:01:55 -0500 (EST) andrew fabbro <afabbro@umich.edu> writes:
On Thu, 26 Feb 1998, Dr. Alan Sherman wrote:
Why doesn't someone speed up the DES search with Hellman's time-space tradeoff, whose precomputation could be done within a month?
Probably because finding spare CPU cycles on thousands of machines is easy and free, while finding the disk storage space that you mention would be expensive, and I doubt distributed.net has the resources. And people who do have the resources are busy doing other things with them, or keep them at Fort Meade.
I forget because I haven't read that part of Applied Crypto in a while, but wasn't it terabytes of storage?
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a CDROM holds about 640 MB, which means that 1563 CDs could hold it. At CompUSA, that were recently selling recordable CD's for $10 for five, but with a mail-in $10 rebate which means you're only paying 32 cents for postage for 5 CD's. .32*1563=$500 or so. Add in the cost of a few CD-R drives @ $300 each = $900 for recording. Combined total=$1400 Yes, but then you have to be able to read them all too. :) I'm not up on CD changers, but how much would sufficient changers cost to read from
On Thu, 26 Feb 1998 vcarlos35@juno.com wrote: those 1500+ CDs? (Remember, we only need to read 1560 of 'em since the CDRs can double as readers... :) Maybe when DVD-ROM gets out there, and somewhat affordable, but not with CDs (IMHO OC). dave ----- David E. Smith, P O Box 324, Cape Girardeau MO 63702 http://bureau42.base.org/people/dave/ dave@bureau42.ml.org "Quite simply, I'm telling you to GROW UP." -- Dunkelzahn's will
participants (4)
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andrew fabbro -
David E. Smith -
Dr. Alan Sherman -
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